tdelibs/kdecore/kmanagerselection.h

/****************************************************************************

 Copyright (C) 2003 Lubos Lunak        <l.lunak@kde.org>

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copy of this software and associated documentation files (the "Software"),
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****************************************************************************/

#ifndef __KMANAGERSELECTION_H
#define __KMANAGERSELECTION_H

#include <tqobject.h>
#include <kdelibs_export.h>

#ifdef Q_MOC_RUN
#define Q_WS_X11
#endif // Q_MOC_RUN

#ifdef Q_WS_X11 // FIXME(E)

#include <X11/Xlib.h>

class KSelectionOwnerPrivate;

/**
 This class implements claiming and owning manager selections, as described
 in the ICCCM, section 2.8. The selection atom is passed to the constructor,
 claim() attemps to claim ownership of the selection, release() gives up
 the selection ownership. Signal lostOwnership() is emitted when the selection
 is claimed by another owner.
 @since 3.2
 @short ICCCM manager selection owner
*/
class KDECORE_EXPORT KSelectionOwner
    : public TQObject
    {
    Q_OBJECT
    public:
        /**
         * This constructor initializes the object, but doesn't perform any
         * operation on the selection.
         *
         * @param selection atom representing the manager selection
         * @param screen X screen, or -1 for default
         * @param parent parent object, or NULL if there is none
         */
        KSelectionOwner( Atom selection, int screen = -1, TQObject* parent = NULL );
        /**
         * @overload
         * This constructor accepts the selection name and creates the appropriate atom
         * for it automatically.
         *
         * @param selection name of the manager selection
         * @param screen X screen, or -1 for default
         * @param parent parent object, or NULL if there is none
         */
        KSelectionOwner( const char* selection, int screen = -1, TQObject* parent = NULL );
        /**
         * Destructor. Calls release().
         */
	virtual ~KSelectionOwner();
        /**
         * This function attemps to claim ownership of the manager selection, using
         * the current X timestamp. If @p force is false, and the selection is already
         * owned, the selection is not claimed, and false is returned. If claiming
         * is forced and the selection is owned by another client, it is waited for up to 1 second
         * for the previous owner to disown the selection, if @p force_kill is true,
         * and the previous owner fails to disown the selection in time,
         * it will be forcibly killed. True is returned after successfully claiming
         * ownership of the selection.
         */
        bool claim( bool force, bool force_kill = true );
        /**
         * If the selection is owned, the ownership is given up.
         */
        void release();
        /**
         * If the selection is owned, returns the window used internally
         * for owning the selection.
         */
        Window ownerWindow() const; // None if not owning the selection
        /**
         * @internal
         */
	bool filterEvent( XEvent* ev_P ); // internal
    signals:
        /**
         * This signal is emitted if the selection was owned and the ownership
         * has been lost due to another client claiming it, this signal is emitted.
         * IMPORTANT: It's not safe to delete the instance in a slot connected
         * to this signal.
         */
        void lostOwnership();
    protected:
        /**
         * Called for every X event received on the window used for owning
         * the selection. If true is returned, the event is filtered out.
         */
        virtual bool handleMessage( XEvent* ev );
        /**
         * Called when a SelectionRequest event is received. A reply should
         * be sent using the selection handling mechanism described in the ICCCM
         * section 2.
         *
         * @param target requested target type
         * @param property property to use for the reply data
         * @param requestor requestor window
         */
        virtual bool genericReply( Atom target, Atom property, Window requestor );
        /**
         * Called to announce the supported targets, as described in the ICCCM
         * section 2.6. The default implementation announces the required targets
         * MULTIPLE, TIMESTAMP and TARGETS.
         */
        virtual void replyTargets( Atom property, Window requestor );
        /**
         * Called to create atoms needed for claiming the selection and
         * communication using the selection handling mechanism. The default
         * implementation must be called if reimplemented. This method
         * may be called repeatedly.
         */
        virtual void getAtoms();
        /**
         * Sets extra data to be sent in the message sent to root window
         * after successfully claiming a selection. These extra data
         * are in data.l[3] and data.l[4] fields of the XClientMessage.
         */
        void setData( long extra1, long extra2 );
    private:
        void filter_selection_request( XSelectionRequestEvent& ev_P );
        bool handle_selection( Atom target_P, Atom property_P, Window requestor_P );
        const Atom selection;
        const int screen;
        Window window;
        Time timestamp;
        long extra1, extra2;
        static Atom manager_atom;
        static Atom xa_multiple;
        static Atom xa_targets;
        static Atom xa_timestamp;
    protected:
        virtual void virtual_hook( int id, void* data );
    private:
        KSelectionOwnerPrivate* d;
    };

class KSelectionWatcherPrivate;

/**
 This class implements watching manager selections, as described in the ICCCM
 section 2.8. It emits signal newOwner() when a new owner claim the selection,
 and emits lostOwner() when the selection ownership is given up. To find
 out current owner of the selection, owner() can be used.
 @since 3.2
 @short ICCCM manager selection watching
*/
class KDECORE_EXPORT KSelectionWatcher
    : public TQObject
    {
    Q_OBJECT
    public:
        /**
         * This constructor initializes the object, but doesn't perform any
         * operation on the selection.
         *
         * @param selection atom representing the manager selection
         * @param screen X screen, or -1 for default
         * @param parent parent object, or NULL if there is none
         */
        KSelectionWatcher( Atom selection, int screen = -1, TQObject* parent = NULL );
        /**
         * @overload
         * This constructor accepts the selection name and creates the appropriate atom
         * for it automatically.
         *
         * @param selection name of the manager selection
         * @param screen X screen, or -1 for default
         * @param parent parent object, or NULL if there is none
         */
        KSelectionWatcher( const char* selection, int screen = -1, TQObject* parent = NULL );
	virtual ~KSelectionWatcher();
        /**
         * Return the current owner of the manager selection, if any.
         */
        Window owner();
        /**
         * @internal
         */
        void filterEvent( XEvent* ev_P ); // internal
    signals:
        /**
         * This signal is emitted when the selection is successfully claimed by a new
         * owner.
         * @param owner the new owner of the selection
         */
        void newOwner( Window owner );
        /**
         * This signal is emitted when the selection is given up, i.e. there's no
         * owner. Note that the selection may be immediatelly claimed again,
         * so the newOwner() signal may be emitted right after this one.
         * It's safe to delete the instance in a slot connected to this signal.
         */
        void lostOwner();
    private:
        void init();
        const Atom selection;
        const int screen;
        Window selection_owner;
        static Atom manager_atom;
    protected:
        virtual void virtual_hook( int id, void* data );
    private:
        KSelectionWatcherPrivate* d;
    };

#endif
#endif